The part number **554AC000393DG** refers to a high-performance **Voltage-Controlled Crystal Oscillator (VCXO)** manufactured by **Skyworks Solutions, Inc.** (formerly Silicon Labs). --- ### 1. General Specifications This component belongs to the Si554 series, known for ultra-low jitter and high reliability in networking and telecommunications. | Feature | Specification | | :--- | :--- | | **Manufacturer** | Skyworks Solutions Inc. | | **Series** | Si554 | | **Function** | VCXO (Voltage Controlled Crystal Oscillator) | | **Output Frequency** | 156.25 MHz (Commonly used in Ethernet) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Voltage Supply** | 3.3V | | **Package / Case** | 6-SMD, No Lead (7mm x 5mm) | --- ### 2. Key Technical Attributes * **Low Jitter:** It features "DSPLL" technology, which provides superior supply noise rejection and reduces phase jitter (typically <0.3 ps RMS), essential for high-speed data transmission. * **Voltage Control:** The "VC" in VCXO allows the output frequency to be adjusted (pulled) by varying the input control voltage. This is critical for clock synchronization and Phase-Locked Loops (PLLs). * **Differential Output:** Using **LVPECL** ensures high-speed switching and excellent noise immunity over long PCB traces. --- ### 3. Decoding the Part Number The part number follows a specific nomenclature defined by Skyworks/Silicon Labs: | Segment | Meaning | | :--- | :--- | | **554** | Series Identifier (Dual Frequency VCXO / Ultra-low jitter) | | **A** | Temperature Stability / Pull Range Grade | | **C** | Output Format (LVPECL) | | **000393** | Unique Configuration ID (Sets the base frequency and parameters) | | **D** | Temperature Range (-40°C to +85°C) | | **G** | Package/Finish (Lead-free, RoHS compliant) | --- ### 4. Common Applications * **Networking:** 10G/40G/100G Ethernet switches and routers. * **Telecommunications:** SONET/SDH/OTN systems. * **Data Centers:** High-speed server clocks and storage area networks. * **FPGA Clocking:** Providing stable, low-noise reference clocks for high-end FPGAs.